In this universe couples simply do not conceive their own children. Here they purchase them. Children are judged at birth at what category they 'belong' in. You are either a 100, 200, 300, etc. 500 is the highest ranking. 500s are seen as the most physically appealing and smartest children. They grow up in a room full of new books, clothes, and school supplies. they have it all. 100s have the least. They rarely have any books, all their clothes have holes and none of the toys are in good shape. 200s, 300s, and 400s are in between. Sam is a 100. He feels left out and he doesn't understand why he's a 100. He feels all kids should grow up in the same environment. Here is Sam's story as he grows up with his best friends Trevor and Maria.